Radio tuning mechanism



June 1931- v A. CROSSLEY ET AL 5 35 RADIO TUNING MEQHANI SM FiledJunn27, 1930 2 Sheets-Sheet 1 J ne 9, 1931. A. CROSSLEY ET AL RADIOTUNING MECHANISM Filed June 27, 1930 2 Sheets-Sheet 2 I ofeZZnaZ/Y/an'fen R v %;ww2m,

Patented June 9, 1931 um'r an stares PATENT OFFICE ALFRED CROSSLEY ANT)LELAND H. HANSEN, OF SOUTH HAVEN, MICmG-AN, ASSIGNOM TO HOWARD RADIOCOMPANY, OF SOUTH HAVEN, MICHIGAN, A. CORPGRATION F ILLINOIS Applicationfiled June 27,

This'invention relates to improvements in radio tuning mechamsm and,more especially, such mechamsm adapted for use with radio receivers.

Among the features of our invention is the rovision of such rnechanlsmthat is slmple in constructmn and operatlon, and also accurate, durableand eficient.

panying drawings- Figure 1 is a view in front elevation; Fig. 2 is a topplan view; Fig. 3 is a view similar to Fig. 2 with the scale removed;Fig. 4 is an enlarged detail view in front elevation of the frictiondisks; Fig, 5 is an enlarged detail described, as they form no part ofthe resent invention. It will suficeto say thatthis chassis, as isfrequently the case, may be provided with a plurality of or gang ofcondenserslO (here shown as I densers are controlled by the shafts 11,12,13

and 14, and in the tuning of the receiver, in

accordance with common practice, it is'necessary or desirable to rotatethese shafts si- 7 00-0 liretmg on t e shaft 17 adapted to bemanuallop-' erated by the M01018; The disk 16. as a.

multaneously.

Our invention relates to mechanism for manually simultaneously rotatinga plurality of shafts, such as the condenser shafts 11,-

12, 13 and-1a..

. This mechanlsm includes a driven friction disk 15 on the shaft 13,provided with a peripheral groove 15. Numeral 16 indicates a drivingfriction disk mounted four in number). These conname TUNING-MECHANISM1930. Serial No: 464,409.

narrowed periphery 16 frictionally engagmg; the walls of the groove 15,whereby rotation of the knob 18 will rotate the disk 15 and,consequently, the shaft 13 of one of the condensers.

Means are provided for interconnecting the shafts so that asthe shaft 13is rotated, the other shafts 11, 12 and 14 are simultaneously rotatedsynchronously therewith. Such means include pulleys on the shafts withbelts interconnecting the same. These pulleys on the shafts 11, '12, 13and 14: are. indicated by the numerals 21, 22, 23 and 24,

ed respectively, the pulleys 22 and 23 being wide enough to receive twobelts. Rotationv of the pulley 23 imparts rotation to the pulleys 22 and24 throu h the belts 25 and 26, respectively. The pu ley 21 is rotatedfrom the pulley 22 through the belt 27.

The belts 25, 26 .and 27 are preferably made of thin metal ribbons withlittle or no stretch. falippage on the pulleys is prevented by frictionand, also, by means of the radial pins 28 in the peripheries of thepulleys projecting through holes in the belts.

Means are provided for visibly showing the setting of the'mechanism.Such means includes ahorizont-ally arr-an ed reci rocable I elongatedscale 30 with suita 1e mar ings or calibrations 30. This scale isslida-bly mounted between the guide members 31, 31. Movement is im artedto the scale by a flexible member, suc as a cord 32 wrapped about thecove 15 in the disk 15, with its ends passing over the pulleys 33(adjacent the ends of the guide members 31) and attached to the endsofthe scale at 32 The scale 30 may be made of translucent material, suchas celluloid, and the markings thereon illuminated by means of a-lamp 35behind the same. Numeral 36 may indicate a stationary mark on one of theguide members 31 to aid in indicating movements of the scale, and inFig. his shown a portion of the front wall 37 of an outer case providedwith a window 38 for viewing the scale 30, the margin of such windowcontaining a stationary mark or arrow 36- similar to the mark 36 abovedescribed. I

,WhiIe we have shown and described cert'ain embodiments of ourinvention, it is'to 'be understood that it is capable of manymodifications. Changes, therefore, in the construction and arrangementmay be made 5 without departing from the spirit and scope of ourinvention, as disclosed in the appended claims, in which it is ourintention to claim all novelty inherent in our invention as broadly aspermissible, in view of the 7 1 prior art.

I What we regard as new, and desire to secure by Letters Patent, is: I

' 1. In combination with a lurality of shafts, tuning mechanism of t echaracter 15 described, for simultaneously rotating said shafts, saidtunin mechanism including; a ooved driven friction disk on one of the safts; a eo-operating drivin friction disk;

7 pulleys mounted on said. sha s; belts interconnecting said pulleys,whereby rotation of one shaft will simultaneously rotate the othershafts; and an elongated scale reciprocated by a flexible member woundabout the groove in the'driven friction disk with its ends at- I tachedto the ends of the scale.

' 2. In combination with a 'lurality of shafts, tuning mechanism of t echaracter described for simultaneously rotating said shafts, said tuningmechanism including; a driven friction disk on one of the shafts,

. said friction disk being provided with a peripheral groove; aco-operatin driving friction disk, the periphery of e same frictionallyengaging the walls of the periph- I eral groove in the driven frictiondisk;

'- pulleys mounted on said shafts; belts interconnecting said pulleyswhereby rotation of one shaft will simultaneously rotate the othershafts; and an elongated scale reciprocated Q by a flexible memberwrapped about the groove in the driven disk with its ends attached tothe scale. 1 19gitness 'our hands 21st day ofJune, a ALFRED CROSSLEY.

" LELAND H. HANSEN.-

